本文对天然气重整制氢型固定式发电用燃料电池堆进行时长为1.9万h的耐久测试，并对衰减前后的膜电极的电化学特性、微观结构变化、催化剂成分变化进行研究。结果表明：经过耐久性测试后的电堆膜电极电压衰减27.6%，电堆输出功率显著下降，耐CO性能降低。质子交换膜变薄，催化剂流失，催化剂中Pt和Ru含量（质量分数）显著下降，催化剂层出现开裂、坍塌现象。催化剂粒径由5～6 nm增长至8～10 nm，并且出现直径约为100 nm的催化剂团聚颗粒。催化剂流失和微观结构变化是燃料电池电化学性能衰减的重要原因。

This article conducted a durability test of 19 000 hours on a fixed fuel cell stack for hydrogen production from natural gas reforming, and studied the electrochemical characteristics,microstructure changes, and catalyst composition changes of the membrane electrode before and after attenuation. The research results show that after durability testing, the voltage degradation of the stack membrane electrode is 27.6%, the output power of the stack is significantly reduced, and the anti CO ability is reduced. The proton exchange membrane becomes thinner, and the surface catalyst is lost. The content of Pt and Ru in the catalyst significantly decreases, and the catalyst layer cracks and collapses. The particle size of the catalyst increased from 5～6 nm to 8～10 nm, and catalyst agglomerates with a diameter of approximately 100 nm appeared. Catalyst loss and microstructure changes are important reasons for the electrochemical performance degradation of fuel cells.